Difficult to start if it sits in the hot sun, no problem all last winter

What is your question?

Battery is ok , it will sit and try to turn over but takes 4 to 5 attempts to crank. No problem while running. Took to dealer last summer same problem they found nothing as it cooled last fall the problem went away. Restarted this month, in the morning starts easier by 12 it is difficult to start.